From: Lennart Poettering <lennart@poettering.net>
Date: Thu, 8 Dec 2016 16:15:06 +0000 (+0100)
Subject: util-lib: accept invoking chase_symlinks() with a NULL return parameter
X-Git-Tag: v233.3~125
X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=commitdiff_plain;h=c7a64b3cac7ac3db89bbe0b9b1e826cd65e44b5d;p=elogind.git

util-lib: accept invoking chase_symlinks() with a NULL return parameter

Let's permit invoking chase_symlinks() with a NULL return parameter. If so, the
resolved name is not returned, and call is useful for checking for existance of
a file, without actually returning its ultimate path.
---

diff --git a/src/basic/fs-util.c b/src/basic/fs-util.c
index 4d494650c..471708bbe 100644
--- a/src/basic/fs-util.c
+++ b/src/basic/fs-util.c
@@ -813,8 +813,10 @@ int chase_symlinks(const char *path, const char *original_root, unsigned flags,
                         return -ENOMEM;
         }
 
-        *ret = done;
-        done = NULL;
+        if (ret) {
+                *ret = done;
+                done = NULL;
+        }
 
         return exists;
 }